Last night, I watched (again) the documentary,What Plants Talk About. Did you know that plants change their chemistry based on the environmental stressors they experience? So, for example, if a certain caterpillar is munching on their leaves, they can release chemicals into the air, scents, that attract the insect predator of that caterpillar. Or they might offer nectars that shift the scent of the bug itself, and that scent attracts predators. They also share nutrients with their child plants and other tree species in a forest.

This got me thinking about our human use of plants for healing. We benefit from their chemical wizardry and can use their medicines for our own challenges. Over thousands of years of human “prehistory” and “history,” we learned the benefits of so many various plants in our environment. A body of knowledge has accumulated for the medicinal use of herbs.

Plant medicines can also be used to help other plants. Michael Phillips, in the book Holistic Orchard, recommends making fermented teas of comfrey, horsetail, stinging nettles, and/or garlic scapes to use as a foliar spray to help orchard trees during the summer. Comfrey provides large amounts of calcium. Horsetail has natural silica which helps the plant cuticle defense against certain summer fungi. Nettles are a tonic of overall nutrition with trace minerals, vitamins, nitrogen, calcium, and potassium. They also have silica, with levels skyrocketing when seeds formation is just beginning, so that is a great time to use it. Garlic helps to carry other nutrients.

It just so happens that I was in the orchard last week, thinking I needed to trim back the comfrey because it was getting too big. Then I noticed that the nettles in Sylvia’s herb garden were flowering, maybe starting to form seeds. (We’d rather that they didn’t spread nettles everywhere.) And lo and behold, the garlic plants had formed scapes. So maybe it was time to make some herbal tea. (We don’t have any horsetail, sadly.)

To make the fermented tea, you use a five-gallon bucket. Cut plant leaves into the bucket and loosely pack them in. Then, pour a kettle of boiling water over the leaves to get things started, and add unchlorinated water to fill it to the top. I used water from our rain barrels. Then “let sit for seven to ten days somewhere outside, loosely covered to prevent significant evaporation. This fermentation period makes the constituents that much more bioavailable for foliar absorption.” It gets pretty smelly with sulfur compounds–that’s how it is supposed to smell. You strain it when you use it. Once brewed, you dilute it, using about a cup of the tea per gallon of spray.

So I made the tea on July 6. It is likely ready to use about now, though I went ahead and added two cups to the spray formula I did on July 9th. Having such a small orchard, I might not be able to use all of the tea in a timely way, so I figured that partially brewed tea would add something beneficial in any case. I will add whatever I don’t use to the compost pile.

A few other thoughts were brewing in my mind after watching What Plants Talk About. If you think about how plants change their chemicals to fit their environmental stressors, you have to conclude that the medicines in the plants might be changing day by day, hour by hour. So when you harvest that plant, and in what condition you harvest it, might make all the difference in the world about whether that plant has the medicine you need. And perhaps that is the source of the “old wives’ tales” about when and how to pick various medicinal herbs. When the moon is full, or first thing in the morning? (By the way, I think that old wives’ tales are often the source of much hidden wisdom.)

If I were a young person just starting out as a scientist herbalist, I would want to ponder how we might experiment and cooperate with plants to create particular medicines that we need. We’d have to start by understanding and measuring the differences in their chemical composition under various conditions. Try to better understand why the old herbalists knew the best times for picking. That might take a while. But then, once we better understood these marvelous beings, maybe we could learn to communicate back and forth with them, and then, perhaps we could invite them to create new medicines for the diseases we face in these times. What a line of research that would be!